<template>
  <div class="xtx-infinite-loading" ref="target">
    <div class="loading" v-if="loading">
      <span class="img"></span>
      <span class="text">正在加载...</span>
    </div>
    <div class="none" v-if="finished">
      <span class="img"></span>
      <span class="text">亲，没有更多了</span>
    </div>
  </div>
</template>
<script>
import {ref} from 'vue'
import { useIntersectionObserver } from '@vueuse/core'
export default {
  name:'XtxInfiniteLoading',
  props:{
    loading:{
      type:Boolean,
      default:false
    },
    finished:{
      type:Boolean,
      default:false
    }
  },
  setup(props,{emit}){
    const target =ref(null)
    //监听target是否进入可视区
    const {stop}= useIntersectionObserver(target,([{isIntersecting}])=>{
      if(isIntersecting){
        //触发加载事件条件：请求加载（loading）完成，数据加载（finished）完成
        if(!props.loading && !props.finished){
          emit('infinite')
        }
      }
    },{threshold:0})
    return {target}
  }
}
</script>

<style scoped lang="less">
.xtx-infinite-loading {
  .loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    .img {
      width: 50px;
      height: 50px;
      background: url(../../assets/images/load.gif) no-repeat center / contain;
    }
    .text {
      color: #999;
      font-size: 16px;
    }
  }
  .none {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    .img {
      width: 200px;
      height: 134px;
      background: url(../../assets/images/none.png) no-repeat center / contain;
    }
    .text {
      color: #999;
      font-size: 16px;
    }
  }
}
</style>
